MarvinJS atto plugin (atto_structure) for Moodle.
Alows users to create chemical structures and reactions then easily
insert image into Moodle.

Quick Installation
1) Download and install MarvinJS from www.chemaxon.com.
2) Place the structure folder in your lib/editor/atto/plugins folder.
3) Proceed to the notifications section of the admin panel.
4) Confirm installation of moodle-atto_structure
5) Set the path to MarvinJS in the settings page that appears 
   or proceed to admin setting for this filter and set path).
6) Proceed to Site administration > Plugins > Text editors > Atto HTML 
   editor > Atto toolbar settings and add the new plugin to the tool bar
   config, by adding "structure" at the end of one of the rows of buttons.